Judging from the bolts and nuts, are those split rims? Would make the supposedly frequent changes much more easy. They seem to be metal rims, too. Maybe not as elegant as the wooden spoked ones still occasionally used back then, but much sturdier.

Front tires are Firestones; back tires have "SAMSON CORD", was that a Firestone brand? Two leather straps plus the standard hood latches, water bag; dude was ready for anything. Like the leather (?) deflector just behind the spotlight.